Malicious PDF — malware analysis report

Static analysis result for SHA-256 122be17eb4de8ada…

MALICIOUS

PDF

72.7 KB Created: 2021-02-27 04:25:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e6e53bbc2b8e089ab6a7510623a3ceef SHA-1: 41991db54a7254392c7367cea9d7dd870d78cf40 SHA-256: 122be17eb4de8ada838a5659e73d0c696b1fd37ea0efbbeddc4a9e07564081c9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, many hosted on disposable domains, forming a link farm. The document body, though heavily obfuscated, suggests a lure related to 'biology workbook 9th grade'. The presence of embedded URLs and the link farm structure strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/strik?utm_term=biology+workbook+9th+grade PDF link annotation
    • https://cdn.sqhk.co/tajiwikiter/jcgjBh7/bisaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_5fe9ad1f6a88c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5fcf8c051936f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5fe92a6649735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453909/normal_60302965dc075.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/N4ijMie/dream_piano_tiles_mod_apk_download.pdfIn PDF document text
    • http://desokore.medianewsonline.com/is_moroccan_argan_oil_good_for_acne.pdfIn PDF document text
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/badafevim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_602b04ecb55b4.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/3724130.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387814/normal_5fca0f019ffeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371809/normal_5fca34ef546b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_600be173349a1.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/zonajelubimaraj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499023/normal_602f99e887c4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fedure/rovebeguwetek.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/log_book_design_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/52826448888.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 5196 bytes
SHA-256: 8209b4ac4d8f06fcedbfa6e365d2668cc7bf40d3d123ccd0b105d341435ed9a2
font_01_sfnt_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 10836 bytes
SHA-256: 38518da0dbd481d1da31a8dc14b49f2d8dca8d18e72924594cac3f087ea5f507
font_02_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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